Hi, for some reason the O option in TH1::Fit() doesn't seem to work. The following code shouldn't draw the histogram, but it does. Strangely, the source code (viewed through the class category documentation) seems to be OK? TF1 *theory = new TF1("theory", "expo(0)", 0, 1); theory->SetParameters(1, -1); TH1D *data = new TH1D("data", "raw data", 20, 0, 1); data->FillRandom("theory", 500); TF1 *f = new TF1("f", "pol3(0)", 0, 1); data->Fit("f", "OQ"); // the histogram gets drawn! Please send a reply also to my e-mail address. Ville
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